Hydraulic device for emptying furnaces



Dec. 22, 1931. o. UHDE ET AL HYDRAULIC DEVIGE FOR EMPTYING FURNACESOriginal Filed Jan.

Invenfom; 0% RM W5 [(#88- Patented Dec. 22, 1931 Wire!) srArEs PATENTOFF ICE OTTO UHDE, OF HAMBURG, AND VICTOR KOLB, OFFRANKFoRT-oNsTfiE-MAIN GERMANY HYDRAULIC DEVICE FOREMPTYILTG FURNACESOriginal application filed January 22, 1929, Serial No. 334,279, and inGermany August 5, 1928.

and this application filed March 11, 1930. Serial No. 4=34,984.

The invention relates to hydraulic devices mounted for emptying shaftfurnaces and other furnaces provided with ahearth, especiallyrefuse-burning furnaces, by means of an ejecting shield forming one wallof the hearth, and the invention resides in the fact that the movablepart of the hydraulic drive carrying the shield is guided at the frontin the furnace casing and'behind the same in a straight guide, both thefixed part of the drive and the straight guide being mounted so thatthey can turn about a horizontal axis at the outer end.

The hitherto known arrangements of this type do not take sufficientlyinto account the fact that furnaces, especially shaft furnaces, undergochanges in length under the action of the heat. this being generallydesignated as theswelling of the furnace. In one of the devices hithertoproposed a certain flexibility of the ejecting device is obtained inthat the hydraulic cylinder is mounted so that itcan swing at the outerend, and the shield articulated to theplunger rod, together with aprotective housing located on the shield and extending to the outside.form the front support and. the guiding means for the ejecting device.In contrast to this device. according to the present invention, twoguides separate from each other are provided so that the possibility offitting the ejecting shield to the movements of the furnace wall isincreased and a tighter joint is to be expected. In order that thedistortion of the furnace casing under the action of the heat will causeno jam iningof the cylinder in the guides, adjusting means. for instancescrew adjustments, are provided in the mounting of the cylinder in thecasing.

When operating the ejecting shield according to the invention it is, ofcourse. unavoidable that incandescent-cinders should fall on the shieldsupports. In order that no disturbance in operation of the operatingengine should be produced'by these cindersyaccording to the inventionthe ejecting shield is not mounted on the plunger rod, but fixed to thecylinder, i. e., the cylinder is made movable and the piston. withpiston rod. stationary. The piston rod is thus protected Divided fromdirt and corrosion and therefore a tight joint between the piston rodand thecylinder is constantly assured. A control of the ejecting machineby means of the lmown valve gears can be provided. An especially simplecontrol is obtained, however, if during the emptying operation the waterunder pressure is used as cooling agent for the ejecting shield, anda'special supply of cooling water is provided during the inoperativeperiod of the ejecting shield.

In the accompanying.drawings,Fig. 1 represents a portion of the devicein horizontal section, and Fig. 1a represents the remainder of thedevice in vertical section. Fig. 2 shows the position of the control forthe reverse stroke. Figs. 3 and 4: are cross-sectional views on lines3-3 and 4-4t, respectively, of Fig. 1.

The device consists essentially of the mov able cylinder 6, thewater-cooled ejecting shield 7 secured on the cylinder 6 at the side ofthe "furnace, a hollow piston rod 8 with piston 9, the built-in tubes 11and 12 for the supply of water under pressure and cooling water, astraight guide 18, 14, 15, for the cylinder 6, and the control apparatuswith two cylinders 16 and 17 for the water under pressure and thecooling water.

The cylinder 6 slides over the stationary piston 9 during operation andwith its packing gland over the fixed, hollow piston rod 8 connectedtothe same. It is also guided by a fixed guide bushing 18 arranged ontherear furnace casing 24 and by two lateral sliding shoes 15 that runbetween the slide rails 14 of a straight guiding frame 13.

under pressure, but during the inoperative condition by a special supplyof cooling water at lower pressure.

The hollow piston rod 8 carries at the side of the furnace a piston 9with bore holes 21 and 22 and forms the passage for the water underpressure for the forward stroke of the machine in the direction of thearrow. It also holds the built-in tubes 11 and 12 that provide passagesfor the water under pressure for the reverse stroke and for the coolingwater for the ejecting shield. The piston valve controls the flow of thecooling wa ter. The piston rod is mounted in two trunnions 23 at therear end.

The cylinder guide consists of a frame 13 with slide rails 14; it isused for relieving the'piston rod packing gland 25 from lat eraldeflections during the working stroke. It is mounted at the rear end intwo trunnions 26 the center of which coincides with the center of thetwo plunger rod trunnions 23, and at the front end near the furnace itis adjustable by means of set screws 27a in two lateral cast-onprojections 27 of the guide bushing 18. This adjustable mounting meansmakes possible an exactly parallel adjustment of the sliding path to thecenter of the cylinder or the axis of the movement of the machine. Inthis way an assured straight guiding is obtained. 7

Since the plane of the section in Fig. 1 is at right angles to the planeof the section in Fig. 1 it willbe clear that the guide and bearingsshown in Fig. 1 are rotated 90 relative to the portion of the deviceshown in Fig. 1a.

The control apparatus consists of two small cylinders 16 and 17 withappertaining pistons 28, 29, 30. 31, 32, 33, 34, packed with leathersleeves of the known type and suitable drive. The pistons of the twocylinders are always moved in the same direction, the two to the rightor left, by'means of a control lever. According to their position, atthe same time, in the forward stroke, the water under pressure isregulated and the flow of the cooling water through the ejecting shieldis interrupted, or in the reverse stroke, the water under pressure isregulated and the flow of cooling water through the shield is againresumed. For instance. the connection diagram of Fig.1 with controllever 40 in the position to the right shows the corresponding positionsof the pistons in the control cylinders and the flow of the water underpressure and the cooling water caused bv the same during the forwardstroke. The water under pressure (solid line flows through the controlcylinder 17 the hollow piston rod 8 and the bore hole 21 of the piston9. into the chamber 36. and forces the cylinder 6 with the shield 7forward. The contents of the furnace hearth after previous opening ofthe turning gates 20 is thrown out over the front edge of the grate 3.The water under pressure at the back of the piston 9 can flow offthrough the pipe 11 and the passages shown by the broken lines 37through the control cylinder 17 into the outlet funnel 38. At the sametime the cooling water follows the broken line 39 through the controlcylinder 16 into the funnel 38. The flow of cooling water to the shieldis therefore interrupted and it is cooled only by the water underpressure.

Fig. 2 with the control lever 40 in the position at the left shows,together with Fig. 1,

the. corresponding positions of the'pistons and the course of the waterunder pressure and-of the cooling water caused by the same during thereverse stroke. The water under pressure (broken line 41) flows throughthe control cylinder 17 following the line 37 through the tube 11 intothe chamber between the piston 9 and the cylinder head 42 and forces thecylinder 6 with the shield 7 backward into the end position. At the sametime the water under pressure in front of the piston 9 in the space 36flowsthrough the bore hole 21, the hollow plunger rod 8, the tube 43following the solid line 44 through the control cylinder 16 into thefunnel 38. At the end of the reverse stroke, the cooling water (tube 45)flows through the control cylinder 16 following the broken line 46through the tube '12, thebore-hole 22, the shield 7 and back through thebore-hole 21, the hollow piston rod 8, the tube 43 in the broken line 44through the control cylinder 16 into the funnel 38. The supply ofcooling water to the ejecting shield is therefore resumed.

During the inoperative condition of the machine, therefore, the ejectingshield is not cooled by water under pressure, but by less expensivecooling water under less pressure, and the pressure pump system canconsequently be made smaller than if the cooling were to be accomplishedonly by water under pressure. Moreover, as shown by a comparison ofFigs. 1 and 2, the same passages can be used to a great extent both forthe cooling water and the water under pressure.

hydraulic drive mechanism therefor, the

movable part of said hydraulic drive mechanism carrying the shield andbeing guided at the furnace end in the furnace casing and back of thefurnace in a rectilinear guide, the fixed parts of said drive mechanismand said guide being vertically movable about a horizontal axis at theirrear ends.

2. Apparatus for emptying furnaces provided with a hearth, especiallyrefuse-burning furnaces, comprising a Water-cooled ejecting shieldforming in its inoperative position one wall of the hearth, areciprocating hydraulic drive mechanism therefor, the movable part ofsaid hydraulic drive mechanism carrying the shield and being guided atthe furnace end in the furnace casing and back of the furnace in arectilinear guide, said guide being adjustably secured to the furnacecasing at the front end, and the fixed parts of said drive mechanism andsaid guide being vertically movable about a hori- Zontal axis at theirrear ends.

3. Apparatus as described in claim l'in which the movable part of thehydraulic drive mechanism is a cylinder slidably movabe lengthwise of afixed piston and piston r0 4. Apparatus as described in claim 1 in whichthe movable part of the hydraulic drive mechanism is a cylinder slidablymovable lengthwise of a fixed piston and piston rod, said pistonincluding passages designed to connect the interior of the water-cooledejecting shield to a pressure Water conduit during the forward strokeand to a cooling water conduit at the end of the reverse stroke.

In testimony whereof, we aflix our signatures.

OTTO UHDE. VICTOR KOLB.

